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Di-ammonium phosphate (DAP) also known as Di-ammonium hydrogen phosphate is one of a series of water-soluble ammonium phosphate salts that can be produced when ammonia reacts with phosphoric acid until the desired PH is obtained. DAP produced gets settled down in the solution and then it is further centrifuged to obtain the crystalline powder of Di-ammonium phosphate.

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Specification of Di Ammonium Phosphate (Pure)

Sr. No Parameters Unit Specified value
1 Appearance Visual observation A white crystalline  powder
2 Solubility 10% solution % w/v Clear & colourless solution
3 pH of 5% solution % w/v 7.8 – 8.5
4 Phosphate (as P2O5) % w/w Min. 52.0 %
5 Assay on dried basis % w/w Min. 99.0%
6 Chloride (as Cl) % w/w Max. 0.01%
7 Sulphate (as SO4) % w/w Max. 0.01%
8 Iron (as Fe) % w/w Max. 0.002 %

Specification of Di Ammonium Phosphate (Technical)

Sr. No Parameters Unit Specified value
1 Appearance Visual observation An off white to white crystalline  powder
2 Solubility 10% solution % w/v Freely soluble in water
3 pH of 5% solution % w/v 7.8 – 9.0
4 Phosphate (as P2O5) % w/w Min. 46.0 %
5 Assay on dried basis % w/w Min. 90.0%
6 Iron (as Fe) % w/w Max. 0.005 %

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